:recycle: added ava for frontend test | removed groupings attribute from chatter

frontend/package.json

         "@prettier/plugin-pug": "^1.19.2",
         "@vitejs/plugin-vue": "^2.2.4",
         "@vue/compiler-sfc": "^3.2.31",
+        "ava": "^4.3.3",
         "cross-env": "^7.0.3",
         "eslint": "^8.11.0",
         "eslint-config-prettier": "^8.5.0",

frontend/src/services/chat.service.js

      * @return {Chatter} our chatter instance object
      */
     constructor() {
-        // Map of each active chat
-        // * this is where we will store all of our groupings on from the backend on user login...
-        this.groupings = {}
-
         // Our pubnub instance
         this.provider = null